added an example of using cv::VideoCapture to read image sequences like 000.pmg, 001.png ... 100.png etc.
removed separate example for reading image sequences and modified starter_video.cpp to better explain the functionality of VideoCapture. I also added a bit more explanation in the documentation of the VideoCapture interface
removed starter_image_sequence.cpp
starter_video.cpp changed CV WINDOW KEEPRATIO to just WINDOW KEEPTATIO to fix build error
starter_video.cpp hid local functions
Merge pull request #823 from pickle27:starter_image_sequence